Microwave baking utensil

Abstract

A microwave baking utensil comprises a unitary body of a porous ceramic material having a cooking surface on its upper side, and pattern of a compound of a Group III, IV or V material ion implanted in its lower support surface. The ion implanted material has an n-type impurity, and a p-type impurity therein.

What is claimed is: 
     
       1. A utensil for microwave baking comprising a unitary body of a porous ceramic material having an upper cooking surface and an underside support surface, and an open pattern of a compound of an inorganic solid carrier and being ion implanted on said underside support surface, said carrier being a material selected from the group consisting of Groups III, IV and V of the periodic table, said material having an n-type impurity that can exist in a valence state higher than the carrier and a p-type impurity that can exist at a valence state lower than said carrier, said compound penetrating the molecules of said ceramic material at said underside surface. 
     
     
       2. The utensil of claim 1 wherein said upper cooking surface is flat substantially throughout its extent. 
     
     
       3. The utensil of claim 1 wherein the underside of said body is provided with raised support ridges. 
     
     
       4. The utensil of claim 1 wherein said pattern has a plurality of concentric circles. 
     
     
       5. The utensil of claim 4 wherein said concentric circles are joined by radially extending sections of said ion implanted compound. 
     
     
       6. The utensil of claim 1 wherein said pattern is comprised of a plurality of separate and discrete areas. 
     
     
       7. The utensil of claim 1 wherein said pattern is free of external conductive connections. 
     
     
       8. The utensil of claim 1 wherein said pattern has a thickness of from about 0.1 to 5 microns.